Improvement in upright dbills



@ntrhtatra fetmt @Hirn PARRITT .LISDELL WORCESTER, MASSACHUSETTS,Letters meenam. 66,672, daad Jazy 16,1867.

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KNOW-AI|L MlilN BY'THESE PRESENTS: That I, PARRITT B'LArsnELL, ofl thecity and county of Worcester, and Commonwealth of Massachusetts,

have invented certain new. and useful Improvements in UprightDrills, ofwhich the following is a full, clear,

anderact description,"refereneebeing had to the accompanying drawings,forming a part of this specification,

Figure 'lV represents a 4front view of an upright drillivith myimprovements applied thereto. Figur-e 2 represents a 'longitudinalcentral section on line A B, iig. 1; and' Y' Figure 3 represents across-section on lineA C '1),'same figure. l

v'.llo enable thoseiskilled in the art to which my invention belongs tomake and use the same, I will proceed to describe it more in detail. l AIn thedrawingsthe part marked A is the base of the frame B, to the topof which is east or fastened the armv C, upon which areplaced orfastened the bearings a a, in which the driving-shaft D runs, and uponthe end of'which is gear b, which takes into gear c, which isvalsosupported by arm C, as fully. indicated in tho drawings. Y. For4 thepurposes of enabling the spindle to be moved longitudinally when inmotion, gear c is providedivith a spline, whichlits4 into'a slot in thedrill-spindle E, the lower end of which is provided 4with a,

tight collar, cl, whichrests upon the top of 'the stand F attached tothe sliding-head G, which is moved np'and4 down" by the screw-spindle orshaft e which passes through a projection on, or a nut, 1, attached `tothe back of the sliding-head G. The screw-spindle ehas a gear, f, whichtakes linto another gear, g, on 4the end of shaft h, which is :supportedin a bearing, z',on the piece j attached to.: the adjustable frame H. A.hand-Wheel, c, is' placed' upon 'the end-oi` shaft h. A steelcollarpieee, m, having a. shoulder, 1t, is iitted upon the spindle E andwithin the bearing-piece F, as fully shown inl the.drawings. The lower`end of spindle IE is turned down somewhat, and hasn screwthread cut.thereon to receive a nut, o, which, connectiontvith acollar, d, 4keepsthe drilllspndle E'fronilongitudinal play, so that the drill p is keptfromdrop'ping as soon as its point breaks through t he article beingbored, upon the table J, which is supported by arm K. attachedto frameB. In the nprightdrills in common use the points of the drills are oftenbroken in this way, in con-sequence of back-lash 4in the spindle. By theuse of nut o the lower bearingof the spindle can be kept so adjusted asto prevent all snclrbreakagos." y Theframe, H has a tongue, 2, whichenters a slot or groove in the frame B, which retains the frame in a'vertical position, while, by meansv of a bolt, I, it can be held in anydesiredposition as respects the frame B. The back of head-piece G ismade in dove-tail form "to fit a dove-tailgroove in the frame H. Apacking-piece, 3, is inserted upon one side of the dove-tail part G, sothat by means of screws 4 said packingpiece can be forced in tocompensate for any wear of the parts.

It will 4be observed that as the drill-spindle is -fed down to the workthe lower bearing moves down with it, and consequently the Vlower end ofthe spindles k'ept steady, which renders the action of the drill moreperfectithun if the end of the spindle was not thus supported.

I' have shown my improvements :applied to arl\ upright drill; but theymay be applied vto a drill in an inclined or horizontal positiornfl Thesliding head-piece Gr may have a rack attached to it so as to be movedup 4and down' by a pinion, theshait of which rests and turns in bearingsattached to frame 1I.

Having described my improvements inrdrills, what I claim therein as newand of myinvention, and'desire to secureby Letters PatentLis-m-v Y I.'.Th'e combination, with the sliding head-piece G- andbearing F, of theupright spindle E, provided with vthe collarsf 'm n ut o, substantiallyas set forth.

2. The combination, with the adjustable' frame H and spindle E, of thesliding head-piece G, screw-shaft e,

'collars m d, andnnt o, constructed and arranged substantially as andfor the purposes set forth.

3; The combination of the sliding head-piece and bearing F with theadjustable frame H and spindle E,

Varranged as and for thepnrposes'set forth.

` PARRITT BLAISDELL.

Witnesses:

Trios. H. Dones, Geo. I-I. MILLER.

